I have a black car. I just like black. I haven't noticed it to be much worse than any other car I've had during the summer. I had a white car of similar dimensions for a while before that and it felt just as hot. Or at least past the threshold of "too hot".
It's not like there's always the choice. My previour car was red, and I wish I could have bought me current one in a bright color, like red or orange, but there was just black or grey, it's so boring